Note 12. Loss Per Share

The calculation of basic and diluted loss per share was as follows:

	Three Months Ended July 31,						Nine Months Ended July 31,
	2017			2016			2017			2016
Numerator
Net loss	$	(17,001	)	$	(11,067	)	$	(43,924	)	$	(38,260	)
Net loss attributable to noncontrolling interest		—			57			—			165
Preferred stock dividend		(800	)		(800	)		(2,400	)		(2,400	)
Net loss attributable to common shareholders	$	(17,801	)	$	(11,810	)	$	(46,324	)	$	(40,495	)
Denominator
Weighted average basic common shares		57,420,050			31,015,658			45,903,033			28,680,596
Effect of dilutive securities ⁽¹⁾		—			—			—			—
Weighted average diluted common shares		57,420,050			31,015,658			45,903,033			28,680,596
Basic loss per share	$	(0.31	)	$	(0.38	)	$	(1.01	)	$	(1.41	)
Diluted loss per share ⁽¹⁾	$	(0.31	)	$	(0.38	)	$	(1.01	)	$	(1.41	)

(1)

Due to the net loss to common shareholders in each of the periods presented above, diluted loss per share was computed without consideration to potentially dilutive instruments as their inclusion would have been antidilutive. As of July 31, 2017 and 2016, potentially dilutive securities excluded from the diluted loss per share calculation are as follows:

	July 31,		July 31,
	2017		2016
May 2017 Offering - Series C Warrants		12,000,000		—
May 2017 Offering - Series D Warrants		10,622,460		—
July 2016 Offering - Series A Warrants		7,680,000		7,680,000
July 2016 Offering - Series B Warrants		—		4,926,000
July 2014 Offering - NRG Warrant		—		166,666
Outstanding options to purchase common stock		316,330		247,776
Unvested Restricted Stock Awards		2,004,330		910,079
5% Series B Cumulative Convertible Preferred Stock		454,043		454,043
Series 1 Preferred Shares to satisfy conversion requirements		15,166		15,166
Total potentially dilutive securities		33,092,329		14,399,730

Refer to Note 12, Redeemable Preferred Stock, which is included in our Annual Report on Form 10-K for the year ended October 31, 2016, for information on the calculation of the common shares upon conversion.